E. T. DtJMBLE-THE SOILS OF TEXAS. 
39 
16* 
17* 
18* 
19+ 
20+ 
Insoluble matter. 
93.051 
94.350 
93.458 
89.230 
90.200 
Soluble silica. 
3.364 
.525 
1.820 
3.810 
3.120 
Potash . 
.114 
.111 
.148 
.032 
.044 
Soda ... . 
.074 
.105 
.080 
.232 
.200 
Lime. 
.031 
.076 
.090 
.200 
.240 
Magnesia. 
.061 
.061 
.031 
.120 
.050 
Manganese. 
.111 
.140 
.121 
.040 
.190 
Iron. 
.611 
2.052 
2.337 
.980 
1 .150 
Alumina . 
.908 
.303 
.779 
1.730 
2.270 
Phosphoric acid. 
.169 
.237 
.295 
Trace 
Trace 
Sulphuric acid. 
.012 
.031 
.105 
.006 
.008 
Carbonic acid. 
.110 
.090 
Water. 
j- .611 
2.035 
.911 
1.870 
1 .740 
Organic and volatile. 
1.670 
.730 
99.117 
99.926 
100.175 
100.030 
100.030 
* Cotton Production, Tenth Census, p. 26. 
+ Fourth Annual Report Geol. Sur. Tex., p. 78. 
The Basal beds are represented by analysis 21, a brown loam from 
Tehuacana, and 22, a black sandy soil from Wills Point. Their richness 
and endurance is readily apparent from the composition. 
21* 
22* 
Insoluble matter. 
92.949 
77.582 
Soluble silica. 
1.421 
10.180 
Potash. 
.140 
.265 
Soda . 
.096 
.130 
Lime . 
.194 
.323 
Magnesia. 
.099 
.257 
Manganese. 
.030 
.042 
1 .433 
2.892 
A Inmina. 
.907 
.358 
4.423 
Phosphoric acid.. 
.115 
Sulphuric acid. 
.081 
. 156 
Water and organic... 
2.124 
3.608 
99.832 
99.973 
* Cotton Pi-oduction, Tenth Census, pp. 27 and 86. 
SOILS OF THE BLACK PRAIRIE. 
The black waxy prairies, comprising the main prairies of that name and 
a smaller strip of similar character just east of the Lower Cross Timbers, 
have for years been recognized as one of the finest bodies of agricultural 
land known. They are almost entirely prairie soil, and take their name 
from their waxy character when wet. While more difficult to till than 
some of the lighter soils, their fertility and endurance are such as to 
make them the favorite soils outside and bottom lands, even if they do 
not rival these in popularity. 
